<?php

/*
 * Copyright (c) 2010-2022 Tim Düsterhus.
 *
 * Use of this software is governed by the Business Source License
 * included in the LICENSE file.
 *
 * Change Date: 2026-03-04
 *
 * On the date above, in accordance with the Business Source
 * License, use of this software will be governed by version 2
 * or later of the General Public License.
 */

namespace chat\system\command;

use wcf\data\user\User;
use wcf\system\exception\UserInputException;
use wcf\system\WCF;

/**
 * Adds helpful functions for commands that operate on a user.
 */
trait TNeedsUser
{
    /**
     * Returns the user with the given username.
     *
     * @param   string  $username
     * @return  \wcf\data\user\User
     */
    protected function getUser($username)
    {
        static $cache = [ ];
        if (!isset($cache[$username])) {
            $cache[$username] = User::getUserByUsername($username);
        }

        return $cache[$username];
    }

    /**
     * Checks whether the given username is valid and throws otherwise.
     *
     * @param   string  $username
     * @return  \wcf\data\user\User
     */
    protected function assertUser($username)
    {
        $user = $this->getUser($username);

        if (!$user->userID) {
            throw new UserInputException(
                'message',
                WCF::getLanguage()->getDynamicVariable(
                    'chat.error.userNotFound',
                    [
                        'username' => $username,
                    ]
                )
            );
        }

        return $user;
    }
}